Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions
Priority MEDIUM 44CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-284.
Summary
Umbraco is a ASP.NET CMS. Under rare conditions a restart of Umbraco can allow unauthorized users access to admin-level permissions. This vulnerability was patched in versions 10.6.1, 11.4.2 and 12.0.1.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00715 53rd percentileScored 2026-11-07
Fix Fixed Umbraco-CMS (umbraco): 10.6.1, 11.4.2Umbraco.Cms.Infrastructure (NuGet): 10.6.1, 11.4.2, 12.0.1+1 more product
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| umbraco | Umbraco-CMS | 9.0.0 to before 10.6.1; 11.0.0 to before 11.4.2; = 12.0.0 | 10.6.1, 11.4.2 | Patch available | CNA |
| — | Umbraco.Cms.Infrastructure (NuGet) | 9.0.0 to before 10.6.1 | 10.6.1 | Patch available | GHSA-h8wc-r4jh-mg7m |
| — | Umbraco.Cms.Infrastructure (NuGet) | 11.0.0 to before 11.4.2 | 11.4.2 | Patch available | GHSA-h8wc-r4jh-mg7m |
| — | Umbraco.Cms.Infrastructure (NuGet) | 12.0.0 to before 12.0.1 | 12.0.1 | Patch available | GHSA-h8wc-r4jh-mg7m |
| — | Umbraco.Cms.Web.BackOffice (NuGet) | 9.0.0 to before 10.6.1 | 10.6.1 | Patch available | GHSA-h8wc-r4jh-mg7m |
| — | Umbraco.Cms.Web.BackOffice (NuGet) | 11.0.0 to before 11.4.2 | 11.4.2 | Patch available | GHSA-h8wc-r4jh-mg7m |
| — | Umbraco.Cms.Web.BackOffice (NuGet) | 12.0.0 to before 12.0.1 | 12.0.1 | Patch available | GHSA-h8wc-r4jh-mg7m |
- Umbraco-CMS Vendorumbraco Affected 9.0.0 to before 10.6.1; 11.0.0 to before 11.4.2; = 12.0.0 Fixed in 10.6.1, 11.4.2 Patch available CNA
- Umbraco.Cms.Infrastructure (NuGet) Vendor— Affected 9.0.0 to before 10.6.1 Fixed in 10.6.1 Patch available GHSA-h8wc-r4jh-mg7m
- Umbraco.Cms.Infrastructure (NuGet) Vendor— Affected 11.0.0 to before 11.4.2 Fixed in 11.4.2 Patch available GHSA-h8wc-r4jh-mg7m
- Umbraco.Cms.Infrastructure (NuGet) Vendor— Affected 12.0.0 to before 12.0.1 Fixed in 12.0.1 Patch available GHSA-h8wc-r4jh-mg7m
- Umbraco.Cms.Web.BackOffice (NuGet) Vendor— Affected 9.0.0 to before 10.6.1 Fixed in 10.6.1 Patch available GHSA-h8wc-r4jh-mg7m
- Umbraco.Cms.Web.BackOffice (NuGet) Vendor— Affected 11.0.0 to before 11.4.2 Fixed in 11.4.2 Patch available GHSA-h8wc-r4jh-mg7m
- Umbraco.Cms.Web.BackOffice (NuGet) Vendor— Affected 12.0.0 to before 12.0.1 Fixed in 12.0.1 Patch available GHSA-h8wc-r4jh-mg7m
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* | 10.0.0 to before 10.6.1; 11.0.0 to before 11.4.2; 12.0.0 to before 12.0.1 | Vulnerable | umbraco |
- cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* Versions 10.0.0 to before 10.6.1; 11.0.0 to before 11.4.2; 12.0.0 to before 12.0.1 Vulnerable ·umbraco
Remediation
- Fix · CNA Umbraco-CMS (umbraco) Fixed in 10.6.1, 11.4.2
- Fix · GHSA-h8wc-r4jh-mg7m Umbraco.Cms.Infrastructure (NuGet) Fixed in 10.6.1 Advisory →
- Fix · GHSA-h8wc-r4jh-mg7m Umbraco.Cms.Infrastructure (NuGet) Fixed in 11.4.2 Advisory →
- Fix · GHSA-h8wc-r4jh-mg7m Umbraco.Cms.Infrastructure (NuGet) Fixed in 12.0.1 Advisory →
- Fix · GHSA-h8wc-r4jh-mg7m Umbraco.Cms.Web.BackOffice (NuGet) Fixed in 10.6.1 Advisory →
- Fix · GHSA-h8wc-r4jh-mg7m Umbraco.Cms.Web.BackOffice (NuGet) Fixed in 11.4.2 Advisory →
- Fix · GHSA-h8wc-r4jh-mg7m Umbraco.Cms.Web.BackOffice (NuGet) Fixed in 12.0.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-37267
- 2026-10-03 Alias added: GHSA-h8wc-r4jh-mg7m
References
Patch 3
Advisory 2
More Umbraco Cms vulnerabilities
- TI-2025-41183 An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute… CVSS 3.1CRITICAL 10.0
- TI-2012-05477 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE CVSS 4.0CRITICAL 9.3
- TI-2021-22392 Umbraco v8.14.1 - 'baseUrl' SSRF CVSS 4.0MEDIUM 6.9
- TI-2024-36846 A stored cross-site scripting (XSS) vulnerability in Umbraco CMS v14.3.1 allows attackers… CVSS 3.1MEDIUM 6.5
- TI-2019-15240 Umbraco CMS 4.11.8 through 7.15.10, and 7.12.4, allows Remote Code Execution by… CVSS 3.1HIGH 7.2
- TI-2020-04738 Cross-site scripting in Umbraco CMS CVSS 3.1MEDIUM 5.4
Sources
- CVE-2023-37267 · CVE Program
- CVE-2023-37267 · NVD
- FIRST EPSS
- GHSA-h8wc-r4jh-mg7m · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences